Enter your hot tub's heater wattage, pump wattage, and usage pattern to see real monthly and annual running cost.
A well-insulated cover cuts heater runtime substantially — heat loss through an old or missing cover is one of the biggest hidden costs of hot tub ownership.
The heater is almost always the larger cost driver since it works to overcome heat loss even between uses, especially in cold climates or with a worn-out cover. A tight-fitting, well-insulated cover can cut heater runtime — and cost — meaningfully compared to an old or damaged one, making it one of the best low-cost upgrades for ongoing hot tub expenses.
Yes — heater runtime rises significantly in cold weather since the tub loses heat faster to the surrounding air, so winter months typically cost more than summer for the same water temperature.
Keeping it at a steady temperature is almost always cheaper than fully reheating from cold, since large temperature swings require far more energy than maintaining a set point.